[qknight]

This PR is adding full CMake support. The only thing left do do is to figure out why 3 of the tests fail:

Motivation

We want to be able to do our of source builds and since we use lots of CMake already this was the only submodule which still forced us to Makefiles.

Also we can now use ninja to build all our source code.

It is now easy to include this code base using CMakeLists.txt from the parent:

add_subdirectory(libs/gherkin-cpp)
link_libraries(PUBLIC gherkin-cpp::gherkin-cpp)

The link_libraries will then also add the headers to the search path.

Tests

What test(s) still fail:

• ./testdata/good/incomplete_scenario.feature
• ./testdata/good/several_examples.feature
• ./testdata/good/incomplete_scenario_outline.feature

All other work! But I think that I did not cause those fails. Probably the tests need updates...

$ make test.run
[  3%] Built target fmem
[ 91%] Built target gherkin
[ 96%] Built target gherkin-cpp
[100%] Built target test
Running the tests
                        ./testdata/good/example_token_multiple.feature -> OK
                                    ./testdata/good/background.feature -> OK
                   ./testdata/good/scenario_outlines_with_tags.feature -> OK
                           ./testdata/good/incomplete_scenario.feature -> FAIL
                                    ./testdata/good/datatables.feature -> OK
                                    ./testdata/good/i18n_emoji.feature -> OK
                          ./testdata/good/incomplete_feature_3.feature -> OK
                   ./testdata/good/scenario_outline_no_newline.feature -> OK
                                       ./testdata/good/minimal.feature -> OK
                            ./testdata/good/spaces_in_language.feature -> OK
                                    ./testdata/good/docstrings.feature -> OK
                                 ./testdata/good/escaped_pipes.feature -> OK
                                          ./testdata/good/tags.feature -> OK
                          ./testdata/good/incomplete_feature_2.feature -> OK
                       ./testdata/good/incomplete_background_1.feature -> OK
                              ./testdata/good/several_examples.feature -> FAIL
                                      ./testdata/good/language.feature -> OK
                                       ./testdata/good/i18n_no.feature -> OK
                     ./testdata/good/example_tokens_everywhere.feature -> OK
                                  ./testdata/good/descriptions.feature -> OK
                   ./testdata/good/incomplete_scenario_outline.feature -> FAIL
                              ./testdata/good/scenario_outline.feature -> OK
                       ./testdata/good/incomplete_background_2.feature -> OK
                          ./testdata/good/incomplete_feature_1.feature -> OK
                                         ./testdata/good/empty.feature -> OK
                                ./testdata/good/readme_example.feature -> OK
                                       ./testdata/good/i18n_fr.feature -> OK
                               ./testdata/bad/invalid_language.feature -> OK
                            ./testdata/bad/single_parser_error.feature -> OK
                                    ./testdata/bad/not_gherkin.feature -> OK
                        ./testdata/bad/inconsistent_cell_count.feature -> OK
                                 ./testdata/bad/unexpected_eof.feature -> OK
                         ./testdata/bad/multiple_parser_errors.feature -> OK
Compare the *.feature.out to the *.feature.result for each failed test
----------------------------------------------------------------------
At least one test failed, so this script exits with an error (exit code 1)
make[3]: *** [test/CMakeFiles/test.run.dir/build.make:62: test.run] Error 1
make[2]: *** [CMakeFiles/Makefile2:249: test/CMakeFiles/test.run.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:256: test/CMakeFiles/test.run.dir/rule] Error 2